Cochlear coralline crust covering a rock surface. Jacobsbaai, Western Cape (2020) - iNaturalist Cochlear coralline crust (Spongites yendoi) Hard, encrusting species of crustose coralline algae (Rhodophyta). Thallus relatively thin, mainly composed of filaments of small, often fused, squarish cells, with the lowermost layer up to eight filaments thick of mostly elongated cells. Chalky-white in color,… Continue reading Coralline crust (Spongites spp)